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People have studied SYN attack prevention technology earlier. To sum up, there are mainly two categories, one is through firewall, router and other filter gateway protection, the other is through strengthening TCP/IP protocol stack protection. However, it must be clear that SYN attacks cannot be completely prevented. What we have done is to reduce the harm of SYN attacks as much as possible unless TCP protocol is redesigned.黎章吃过卫江偷袭的亏，如今警觉性极高，立时身子后仰，单臂架住那条腿，就想掀翻他At present, the per capita production of municipal solid waste in China is (0.8 ~ 1.3) kg/person & dot; D, 1.1 kg/person & dot; D is the basis for design (including all the population living in the region). At present, in cities that have built incineration facilities in China, the low calorific value of domestic waste is mostly around 5000kJ/kg, and the water content is generally greater than 50%. Compared with cities in developed countries, it is characterized by low calorific value, high water content, large changes in composition, certain difficulties in garbage incineration, and low thermal efficiency of garbage incineration boilers. In terms of steam parameters, the steam parameters of waste heat boilers in waste incineration plants are usually medium temperature and medium pressure parameters (4MPa and 400 ℃).We can see the above code. The code for creating div is very similar to the code for creating iframe. We can now consider separating the common code to make the code completely abstract. We can now write a set of code that is encapsulated in the getInstance function, as follows:Command cmd = new MyCommand (receiver);1949年，上海解放前夕。物价飞涨，民不聊生，人们经受着失业、饥饿和白色恐怖的威胁，学生们也在为自己的生活和减免费担忧。上海某弄堂中学的学生，正在注视着学校减免费的名单。结果，依靠黑暗势力的阿飞学生吴关根等得到了全免，而家境贫寒的学生江大成和吕小可却只免了三分之一。不公平的待遇引起了学生们的愤懑和不平，失学的危机笼罩在学生们的头上：《新少年报》通讯员江大成为了解决学费问题，把同学们召集起来，与学校展开了斗争。阿飞学生吴关根偷听了江大成的讲话后，密告给反动的朱校长，朱校长在伪警察局吴督察的密令下，借口江大成出售《新少年报》，把他开除。江大成在党的地下工作者杨明老师的诱导下走上了革命道路。在江大成的影响下，吕小可、陈玉珍、何贵生都参加了地下少先队。他们把被查封的《新少年报》改为墙报在学校出版，把革命的道理传播给同学们。地下少先队的孩子们机智勇敢地开展了对敌斗争，他们在深夜来到朱校长的办公室，收听新华社广播，把解放军胜利渡江的消息印成传单，以卖报做掩护，秘密发传单，贴标语，唤起人们的斗志。他们发出的警告信像炸弹一样震动着敌人，使特务吴督察和朱校长惊慌失措，地下少先队的孩子们引起了他们的怀疑。在紧要的关头，杨明老师挺身而出，掩护了孩子们，但却引起了敌人对他的怀疑。江大成得到敌人要逮捕杨明老师的消息，正要去报告，杨明却来到他家，布置迎接上海解放的任务。特务突然赶来追捕杨明，在孩子们的掩护下，杨明安全转移。终于，他们迎来了上海的解放。在雄壮的少先队队歌声中，一批新队员正在举行入队仪式。当江大成为小伙伴带上红领巾时，他的心情无比激动，他决心永远跟着共产党走，做共产主义事业的接班人。I. Current Situation and Problems of Yayao Town